Function: device_disable_peer_access

Product	Supported
Atlas 350 Accelerator Card	√
Atlas A3 training product/Atlas A3 inference product	√
Atlas A2 training product/Atlas A2 inference product	√
Atlas training product	√
Atlas inference product	√
Atlas 200I/500 A2 inference product	x

Disables memory copy between the current device and a specified device. This API disables device-level memory copy.

C Prototype

aclError aclrtDeviceDisablePeerAccess(int32_t peerDeviceId)

Python Function

ret = acl.rt.device_disable_peer_access(peer_dev_id)

Parameter	Description
peer_dev_id	Int, device ID, which must be different from the current device ID. Must be in the range of [0, Device count – 1]. Call acl.rt.get_device_count to obtain the device count.

Parameter

Description

peer_dev_id

Int, device ID, which must be different from the current device ID.

Must be in the range of [0, Device count – 1]. Call acl.rt.get_device_count to obtain the device count.

Return Value	Description
ret	Int, error code. 0 on success; else, failure.

Call acl.rt.device_disable_peer_access twice to enable data exchange between two devices. For example, call acl.rt.device_enable_peer_access once to enable data exchange between device 0 and device 1, and call acl.rt.device_disable_peer_access again to enable data exchange between device 1 and device 0.

Parent topic: Device Management